robinson



' (No Model.)

0. JULIER & J. O. ROBINS 0N.

OVEN- THERMQMBTER.

No. 400,573. Patented Apr. 2, 1889.

l/VVE/VTOR':

W/TA/ESSES:

ATTUH/VE N. Pnzns Phcl0-U\hngnpher, Washington, a. c;

UNITED STATES PATENT OFFICE.

OAMILLA JULIER AND JAMES O. ROBINSON, OF HANGING ROCK, OHIO, ASSIGNORS OF ONE-THIRD TO HENRY D. MILLER, OF SAME PLACE.

OVEN-THERMOMETER.

SPECIFICATION forming part of Letters Patent No. 400,573, dated April 2, 1889.

Application filed Novernher'23, 1888- Serial No. 291,619. (No model.)

To aZl whom it Treaty concern:

Be it known that we, CAMILLA J ULIER and JAMES O. ROBINSON, both of Hanging Rock,

in the county of Lawrence and State of Ohio, have invented a new and Improved Heatrlndicating Attachment for Stoves and other Structures, of which the following is a full, clear, and exact description.

This invention, While it is more particularly designed to be applied to the oven-doors of cooking-stoves, and will here be described accordingly, is also applicable to other stoves, hot-air furnaces or heaters, and ranges.

The invention consists in a combination, Withthe stove, heater, or oven-door, of a heatindicating attachment of special construction, substantially. as hereinafter described, and pointed out in the claim.

Reference is to be had to the accompany- Figure 1 represents an exterior face view of a cooking stove oven-door having our invention applied. Fig.2 is a horizontal or longitudinal section of the same upon the line 00 m in Fig. 1, and Fig. 3 a transverse vertical section thereof upon the line y y in Fig. 1.

A indicates the ovendoor of a cookingstove, a abeing thelugs of the hinge portion thereof.

S is the oven in part.

Upon the inside of said door is attached a hammered-brass or other suitable strip, B, of more expansible metal than the cast-iron of the oven-door, said strip being secured at its ends thereto by bolts or rivets b b, or otherwise. Secured to this strip centrally, or thereabout, between its attached ends, is a stem, 0, fitted to slide through an aperture in the oven-door, and constructed with an inclined projection or nose, d, on its outer end. In ongagement with this inclined nose cl of the stem 0 is an index, 0, pivoted to the stove-door, as at e, and so that said nose on its inner inclined surface will be in contact or be adapted to'come in contact with the inner or shorter arm of the index O. Said index 0 is extended to travel over a graduated dial, D, upon the outside of the oven-door, which will serve to indicate the degrees of heat of the oven. Thus as the heat increases in the oven the superior expansibility of the strip B causes the latter to bow, and by its stem 0 to operate or turn the index 0, so that it will indicate upon the dial D the degree of heat of the oven, and

upon the heat in the oven diminishing said strip B will more or less straighten and the index G will fall back to indicate on the dial the diminished heat.

The attachment can be cheaply and easily applied to the stove, and it will indicate the exact heat of the oven for baking purposes, or, rather, when the stove is ready for baking.

The same appliance may be used upon other stoves, ranges, or heating structures.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is i The combination, with the stove or oven door A, of the strip B, of more expansible metal than that of said door, attached at or near its opposite ends to the door on its interior, the index-actuating stem 0, secured to said strip intermediately of its ends and arranged to slide through the door, and the index C and graduated dial D, both upon the exterior of the door, essentially as shown and described.

OAMILLA J ULIER. JAMES O. ROBINSON.

Witnesses:

JAMES BULL, JAs. HUDSON. 

